1 boiler hp   = 34.5 pounds per hr 1 boiler hp   = 33,479 btu per hr
boiler hp   = btu per hr / 33,479 btu per hr   = boiler hp X 33,479
boiler hp   = pounds per hr / 34.5 pph   = boiler hp X 34.5
natural gas   = 1000 btu per cubic ft #2 oil   = 140,000 btu per gal
#4 oil   = 142 to 146,000 btu per gal #6 oil   = 148 to 154,000 btu per gal
1 psi   = 2.31 ft of head 1 gal (water)   = 8.33 lbs
1 gal   = 231 cubic in 1 cubic ft   = 7.48 gal
1 cubic ft   = 1728 cubic in gal   = cubic ft X 7.48052
cubic ft   = gal X 0.1337 dia   = radius X 2
circum   = dia X 3.1416 area of circle   = dia X dia X 0.7854
vol of cyl   = length X area vol of rect   = length X width X height
cap. in gal   = volume in cubic inches / 231 cap. in gal   = volume in cubic feet X 7.48
1 gal   = 0.2642 liters 1 liter   = 3.78533 gal
1 in   = 2.5400 cm 1 cm   = 0.3937 in